Question

What is the value of $-15+9$?

a.$-24$

b. $-6$

c.$6$

d.$24$

Short answer

The correct value is option b. -6

Step-by-step solution

Step  1.Apply the concept of subtraction of integer

In this, use the concept of subtraction of integer in such a way that always keep the positive and negative sign in mind when subtracting them.

Step 2.Finding the correct value 

Here,

The expression is $-15+9$.

Now, when adding in the above term it is seen that there is a negative sign in higher value and positive sign in positive value, so here it will subtract and it is known that $\text{'}-\text{'}+\text{'}+\text{'}=\text{'}-\text{'}$

So, the correct value be

$\begin{array}{l}=-15+9\\ =-6\end{array}$

The correct Option is B.

Step 3. Eliminating the options to get correct one 

a.$-24$:It is not the correct option because the correct value is$-6$.

b. $-6$: It is the correct option because the correct value is $-6$.

c.$6$: It is not the correct option because the correct value is $-6$not$6$.

d.$24$: It is not the correct option because the correct value is$-6$ not $24$.